The heater element may have failed.
A switch may have failed
If the heater is controlled electronically, a PCB may have failed.
Someone competent should be able to check it out fairly quickly.
A spare element is about 70 quid.
https://m.uk-spares.com/products/heating/domestic/electric-fires/fire/optiflame/exbury
Gdgeheu
March 2018
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